<template>
    <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import echarts from 'echarts';

require('echarts/theme/macarons'); // echarts theme
import {debounce} from '@/utils';

export default {
    props: {
        className: {
            type: String,
            default: 'chart'
        },
        width: {
            type: String,
            default: '100%'
        },
        height: {
            type: String,
            default: '300px'
        }
    },
    data() {
        return {
            chart: null
        };
    },
    mounted() {
        this.initChart();
        this.__resizeHandler = debounce(() => {
            if (this.chart) {
                this.chart.resize();
            }
        }, 100);
        window.addEventListener('resize', this.__resizeHandler);
    },
    beforeDestroy() {
        if (!this.chart) {
            return;
        }
        window.removeEventListener('resize', this.__resizeHandler);
        this.chart.dispose();
        this.chart = null;
    },
    methods: {
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons');
            const data = [{
                name: 'Grandpa',
                children: [{
                    name: 'Uncle Leo',
                    value: 15,
                    children: [{
                        name: 'Cousin Jack',
                        value: 2
                    }, {
                        name: 'Cousin Mary',
                        value: 5,
                        children: [{
                            name: 'Jackson',
                            value: 2
                        }]
                    }, {
                        name: 'Cousin Ben',
                        value: 4
                    }]
                }, {
                    name: 'Father',
                    value: 10,
                    children: [{
                        name: 'Me',
                        value: 5
                    }, {
                        name: 'Brother Peter',
                        value: 1
                    }]
                }]
            }, {
                name: 'Nancy',
                children: [{
                    name: 'Uncle Nike',
                    children: [{
                        name: 'Cousin Betty',
                        value: 1
                    }, {
                        name: 'Cousin Jenny',
                        value: 2
                    }]
                }]
            }];
            this.chart.setOption({
                series: {
                    type: 'sunburst',
                    data: data,
                    radius: [0, '90%'],
                    label: {
                        rotate: 'radial'
                    }
                }
            });
        }
    }
};
</script>
